Validator rollup

[caoboxiao]

No description provided.

[amp-owners-bot]

Hey @ampproject/wg-caching! These files were changed:

extensions/amp-nested-menu/0.1/test/validator-amp-nested-menu-error.out
extensions/amp-nested-menu/validator-amp-nested-menu.protoascii
validator/js/engine/validator.js
validator/js/engine/validator_test.js
validator/testdata/feature_tests/article-json-ld.html
validator/testdata/feature_tests/article-json-ld.out
validator/testdata/feature_tests/duplicate_attribute.html
validator/testdata/feature_tests/duplicate_attribute.out
validator/testdata/feature_tests/duplicate_attribute.out.cpponly
validator/testdata/feature_tests/json-parsing-invalid.html
validator/testdata/feature_tests/json-parsing-invalid.out
validator/testdata/feature_tests/json-parsing-invalid.out.cpponly
+14 more